CN109586816A - High frequency radio signal classification - Google Patents

High frequency radio signal classification Download PDF

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Publication number
CN109586816A
CN109586816A CN201811106593.4A CN201811106593A CN109586816A CN 109586816 A CN109586816 A CN 109586816A CN 201811106593 A CN201811106593 A CN 201811106593A CN 109586816 A CN109586816 A CN 109586816A
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signal
fft
frequency window
window
frequency
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CN201811106593.4A
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CN109586816B (en
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C·弗拉舒
金奎韩
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Hewlett Packard Enterprise Development LP
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Hewlett Packard Enterprise Development LP
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/16—Threshold monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)

Abstract

The present invention relates to high frequency radio signal classification.Example includes classifying to high frequency radio signal.Some examples include: to receive the Fast Fourier Transform (FFT) of high frequency radio signal；Determine the first signal strength at the first protection frequency window；Determine the second signal intensity at the second protection frequency window；And determine the third signal strength at direct current carrier frequency window.Example further includes based on the first signal strength, second signal intensity and third signal strength, to classify to high frequency radio signal.

Description

High frequency radio signal classification
Background technique
Long term evolution (LTE) can be in unauthorized high frequency radio frequency spectrum (such as in the frequency range of 5GHz) Transmit signal.These LTE signals may generate other signals (such as Wi-Fi) transmitted in same frequency range dry It disturbs.
Detailed description of the invention
The following detailed description is with reference to attached drawing, in which:
Fig. 1 is the block diagram according to some exemplary calculating equipment for classifying to high frequency radio signal.
Fig. 2 is the block diagram according to some exemplary calculating equipment for classifying to RF signal.
Fig. 3 is the block diagram according to some exemplary Wi-Fi access points classified to RF signal.
Fig. 4 is shown according to some exemplary LTE and Wi-Fi FFT.
Fig. 5 is the flow chart according to some exemplary methods classified to high frequency radio signal.
Fig. 6 is that according to some exemplary use there is the FFT of at least 100KHz resolution ratio to classify to 5GHz signal The flow chart of method.
Fig. 7 is that according to some exemplary use there is the FFT lower than 100KHz resolution ratio to classify to 5GHz signal The flow chart of method.
Specific embodiment
Many different types of technologies are wirelessly transmitted information by the transmission of the radio wave in radio-frequency spectrum.So And most of radio-frequency spectrum is by government organs' control of Federal Communications Committee (FCC) etc..It is controlled in order to access Spectral regions should sign and issue licensing by the government organs of FCC etc..The radio-frequency spectrum region is considered as licensed spectrum. Due to the limitation in licensed spectrum, the technology usually operated in licensed spectrum starts to widen and enters unauthorized frequency Spectrum.
For example, cellular telephone provider operates long term evolution (LTE) usually in the licensed spectrum of the provider, And the region of the radio-frequency spectrum is specialized authorization to the cellular telephone provider.However, in order to improve covering for cellular network Lid range, these providers are by operating its network in unauthorized 5GHz spectral range, to start to extend it LTE network.
By these technologies expand to unauthorized frequency spectrum may destroy in history in unauthorized frequency spectrum into The technology of row operation.For example, meeting the Wi-Fi equipment of IEEE 802.11a can be operated in 5GHz frequency spectrum.Wi-Fi dress It is standby to can be used in operation of WLAN (WLAN) etc..Therefore, LTE network in unauthorized 5GHz frequency spectrum Operation may lead to the interruption and interference in Wi-Fi signal due to shared, resource allocation of medium etc..
Although LTE attempts by perception Wi-Fi transmission and correspondingly to could be adjusted to the fair neighbours as Wi-Fi, Under normal conditions, LTE can not see Wi-Fi signal in intensive Wi-Fi deployment.This may be since both technologies can not Mutual signal or data packet are decoded.Therefore, LTE access point may make Wi-Fi signal degrade and even all will not Recognize that it is doing so.When Wi-Fi access point can not detect the LTE signal of interference, which may It can not be responded or be adapted to.
Example disclosed herein is by providing the high frequency radio to interference for the network equipment of access point etc. Number mode classified, to solve these challenges.In some instances, the network equipment can receive quick Fu of signal In leaf transformation (FFT).The network equipment can the Fast Fourier Transform (FFT) to signal analyzed with to the signal carry out Classification, and focus on the Wi-Fi signal in the FFT and the different region of LTE signal.In some instances, Wi-Fi signal It is different in its guard band (guard band) and behavior at direct current (DC) carrier wave with LTE signal.Therefore, herein Disclosed example can determine the signal strength in FFT at frequency window corresponding with these positions, and be based on these Signal strength classifies to signal.Therefore, example disclosed herein provides a kind of Wi-Fi access point need not be right LTE signal just understood in the case where being decoded signal whether be LTE signal mode.This can make Wi-Fi access point root It is adjusted correspondingly according to the LTE signal of interference.
In some instances, it calculates equipment and is provided with non-transitory machinable medium.The non-transitory machine Readable storage medium storing program for executing includes instruction, when the instruction is performed, process resource is made to receive the quick Fourier of high frequency radio signal Leaf transformation (FFT).The FFT includes direct current carrier frequency window, the first protection frequency window lower than the direct current carrier frequency window Mouthful and higher than the direct current carrier frequency window second protect frequency window.The storage medium also store instruction, when the instruction It is performed, process resource is made to determine the first signal strength at the first protection frequency window；Determine the second protection frequency window The second signal intensity at place；Determine the third signal strength at direct current carrier frequency window；And classify to signal.It should It is classified based on the first signal strength, second signal intensity and third signal strength.
In some instances, it calculates equipment and is provided with non-transitory machinable medium.The non-transitory machine Readable storage medium storing program for executing includes instruction, when the instruction is performed, process resource is made to receive the quick Fourier of high frequency radio signal Leaf transformation (FFT)；Determine the maximum intensity of FFT；And it determines in FFT more than the quantity of the peak value of first threshold.The storage is situated between Matter further includes to determine the first signal strength at the first protection frequency window and the at the second protection frequency window The instruction of binary signal intensity.This is in response to determining that maximum signal be more than the quantity of first threshold and local peaking is more than the Two threshold values.The storage medium further includes instruction, when the instruction is performed, makes process resource in response to determining the first signal strength Meet third threshold value with second signal intensity, and determines the third signal strength at direct current carrier frequency window.The storage medium Further include instruction, when the instruction is performed, makes process resource based on third signal strength to classify to radiofrequency signal.
In some instances, it provides a method, comprising: the first of high frequency radio signal is received at the network equipment FFT；The first maximum intensity of the first FFT is determined by the network equipment；And it is determined by the network equipment and is higher than the first threshold in the first FFT First quantity of the local peaking of value.This method further include: the 2nd FFT of high frequency radio signal is received at the network equipment； The second maximum intensity of the 2nd FFT is determined by the network equipment；And it is determined in the 2nd FFT by the network equipment higher than first threshold Second quantity of local peaking.This method further comprises: by the network equipment in response to determining the first maximum value and the second maximum Value all meets first threshold and the first quantity and the second quantity all meet second threshold, and based on the first FFT and the 2nd FFT come Determine average FFT.This method further include: the signal strength of the average FFT by the network equipment based on the first protection frequency window, The signal strength of average FFT at second protection frequency window and the signal of the average FFT at direct current carrier frequency window are strong Degree, to classify to high frequency radio signal.
Referring now to the drawings, Fig. 1 is the block diagram to the calculating equipment 100 classified to high frequency radio signal.Such as Used herein, high frequency radio signal is at least radio signal of 2.4GHz.In some instances, high frequency radio It number is at least radio signal of 5GHz.In some instances, high frequency radio signal is in the unlicensed portion of radio-frequency spectrum It is operated in point.The wireless communication technique (for example, Wi-Fi, long term evolution (LTE) etc.) of many types in these high frequencies into Row operation.Therefore, another type of high frequency can be detected according to a type of high frequency radio signal by calculating equipment 100 Radio signal is simultaneously classified (for example, being a seed type rather than another seed type by Modulation recognition) to it.Show some In example, the signal type that calculating equipment 100 can classify therebetween is LTE signal and Wi-Fi signal.
As it is used herein, " calculate equipment " can be server, the network equipment (for example, access point etc.), chipset, Desktop computer, work station or any other processing equipment or equipment.In some instances, calculating equipment 100 can be Wi- Fi access point.
Calculating equipment 100 includes process resource 101 and machine readable storage medium 110.Machine readable storage medium 110 can In the form of being non-transitory machinable medium, electronics, magnetism, optics or other physical stores dress such as appropriate Set, to comprising or storage instruction 111,112,113,114,115, the information of related data etc..
As it is used herein, " machine readable storage medium " may include memory driver (for example, hard disk drive), Flash memory, random access memory (RAM), any kind of storage disk are (for example, compact disc read-only memory (CD-ROM), any Other kinds of CD, DVD etc.) etc. or a combination thereof.In some instances, storage medium can correspond to include wherein soft The memory of main memory (random access memory etc.) and additional storage that part can be resident during runtime.It is auxiliary Help memory can be for example including nonvolatile memory, wherein being stored with software or the copy of other data.
In the example of Fig. 1, instruction 111,112,113,114 and 115 is stored (coding) on storage medium 110 and can It is executed by process resource 101 to realize herein in regard to Fig. 1 described function.In some instances, storage medium 110 can wrap Extra-instruction etc. is included, for example, to realize described by the calculating equipment 200 in Fig. 2 or the Wi-Fi access point 300 in Fig. 3 Some functions instruction.In other examples, the function of any instruction of storage medium 110 can be with the shape of electronic circuit Formula is realized in the form of the executable instruction encoded on machine readable storage medium or in the form of a combination thereof.
Process resource 101 for example can be the form of central processing unit (CPU), the shape of microprocessor based on semiconductor The form of the digital signal processor (DSP) of formula, digital image processing unit etc., be suitable for obtain and execution be stored in Other hardware devices of instruction in storage media or the form of processing element or its combination appropriate.Process resource can be such as Including the single or multiple cores on chip, multiple cores across multiple chips, multiple cores across multiple equipment or its appropriate group It closes.Process resource can be used for obtaining, decoding and execution instruct 111,112,113,114 and 115 as described herein.
Instruction 111 can be executed by process resource 101, to receive the Fast Fourier Transform (FFT) of high frequency radio signal (FFT).Signal may include many frequency components in specific bandwidth.For example, the low-limit frequency signal component of signal can be with It is 5150MHz, and highest frequency signal component can be 5170MHz.Therefore, the range of the signal be from 5150 to 5170MHz and the bandwidth with 20MHz.FFT is expression of the time/spacing wave in its frequency domain, and wherein FFT provides signal Amplitude and phase information.In some instances, sampling and the Fourier transform of signal can be used to determine the signal FFT.In some instances, signal is sampled at discrete point, and therefore, and FFT is in referred to as frequency window (frequency Amplitude reading is provided at discrete point bin).
As it is used herein, frequency window can be in signal specific frequency or frequency range it is relevant any Number.Low-limit frequency window in FFT can correspond to the low-limit frequency in the frequency band of the signal；Highest frequency window can correspond to Highest frequency in the frequency band of the signal；Intermediate frequency window can correspond to the intermediate frequency etc. in the frequency band.Therefore, Frequency window sequence in FFT can correspond to the sequence of the frequency in signal.For example, 512 discrete points of signal can be permitted Perhaps FFT has 256 frequency windows.In the 20MHz frequency band of the highest frequency of low-limit frequency and 5170MHz with 5150MHz In signal, frequency window 1 can correspond to 5150MHz, and frequency window 256 can correspond to 5170MHz.Show as another Example, 128 points of signal can permit FFT with 64 frequency windows.Therefore, with 5150MHz low-limit frequency with In the 20MHz band signal of the highest frequency of 5170MHz, frequency window 1 can correspond to 5150MHz, and frequency window 64 It can correspond to 5170MHz.In some instances, low-limit frequency window can not be 1, it can be Any Digit (example on the contrary Such as, 0).
LTE signal, which can have, makes it with other signals for being operated in identical unlicensed frequency (for example, Wi- Fi signal) characteristic that distinguishes.For example, the LTE signal operated in unlicensed 5GHz frequency can use 20MHz Bandwidth, to make great efforts to coexist in the Wi-Fi signal operated close under frequency.In 20MHz bandwidth, LTE is used using 18MHz In data and 2MHz as guard band.Guard band is not used frequency in signal, to prevent a signal interference Another signal.Therefore, guard band can serve as signal protection boundary or end to end part (book-end).LTE signal can There is a guard band (that is, low 1MHz guard band) of 1MHz with one end of frequency spectrum in the signal, and in the signal Frequency spectrum the other end have 1MHz a guard band (that is, high 1MHz guard band).These guard bands in FFT It is LTE that position and signal strength at these locations, which can be used for the Modulation recognition for helping will test,.
Therefore, instruction 112 can be it is executable so that process resource 101 determine in FFT with the protection in signal Signal strength at the corresponding frequency window of frequency band.The frequency window can be characterized as being " protection frequency window ".In addition, because Be LTE signal tool there are two guard band, thus instruction 113 can be it is executable so that process resource 101 it is determining with it is another Signal strength at the corresponding frequency window of guard band.Therefore, a protection frequency window can be characterized as being " first " Frequency window is protected, and another protection frequency window can be characterized as being " second " protection frequency window.In each protection frequency Signal strength at rate window can also be characterized as being " first " and " second " signal strength.Therefore, frequency window is protected first Signal strength at mouthful can be characterized as being " first " signal strength, and the signal strength at the second protection frequency window can To be characterized as being " second " signal strength.Because guard band serves as protection boundary, a guard band is located at LTE signal In low-limit frequency at (that is, low guard band), and another guard band is located at the highest frequency in LTE signal (that is, high protect Protect frequency band).
By the way that frequency window will be protected to be arranged at window corresponding with the guard band in signal and determined at that The signal strength of FFT at a little set protection frequency windows, can determine the signal without 20MHz bandwidth.These Signal can be classified as not be LTE.Note that protection frequency window is the window as predetermined window.In other words, these windows It is arranged on the position that guard band should be in 20MHz signal, and can be with the real protection frequency in the signal that is classified Band is related or uncorrelated.For example, 40MHz signal may not have guard band at the second protection frequency window, but should 40MHz signal will have protection frequency window in its FFT.As another example, 20MHz signal can protect frequency first There is guard band at window, and there is guard band at the second protection frequency window.
In some instances, to determine that the instruction 112 of the first signal strength can also include: to determine that the first signal is strong FFT is normalized before degree the instruction of (normalize).This can by will in FFT first protection frequency window at Signal strength divided by FFT euclideam norm (Euclidean norm) Lai Shixian.In addition, to determine that second signal is strong The instruction 113 of degree can also include: the instruction that FFT is normalized before determining second signal intensity.This can pass through Signal strength at the second protection frequency window in FFT is realized divided by the euclideam norm of FFT.The normalization of FFT The noise and inaccuracy in FFT can be helped to reduce.Therefore, identified first signal strength and second signal intensity can be with It is the signal strength after normalization.
In some instances, instruction 112 may include to determine multiple frequency windows corresponding with the first guard band Mouthful place signal strength and by these signal strengths be averaging together with determination the first guard band signal strength instruction. This is because many frequency windows can correspond to the first guard band, how this frequency window depended in FFT is spaced It opens.For example, 12 minimum frequency windows can all correspond to the first guard band in the FFT with 256 samplings. Therefore, in some instances, minimum any one of 12 frequency windows can be used alone as the first protection frequency window, And the signal strength at the specific frequency window is used as the first signal strength.In other examples, this 12 lowest frequencies The average value of signal strength at rate window is used as the first signal strength.Similarly, instruction 113 may include to determination Signal strength at multiple frequency windows corresponding with the second guard band and will be averaging together with these signal strengths with Determine the instruction of the signal strength of the second guard band.For example, in the FFT with 256 samplings, highest 12 frequency windows Mouth can all correspond to the second guard band.
Another distinguishing characteristics in LTE signal can be the subcarrier that LTE is used.LTE signal can will be multiple orthogonal Frequency division multiplexing (OFDM) subcarrier condenses together to form signal.OFDM can closely squeeze multiple modulated subcarriers It forces together, to reduce bandwidth needed for signal, but it is mutually orthogonal to be to maintain modulated signal, therefore they will not do each other It disturbs.Subcarrier in LTE signal can be direct current (DC) carrier wave.In 20MHz LTE signal, DC carrier wave can have relative to The different characteristics of other carrier waves.
Therefore, instruction 114 can be executable, so that process resource 101 determines frequency relevant to DC carrier frequency Signal strength at window.The frequency window can be characterized as being DC carrier frequency window.In 20MHz LTE signal, DC is carried The frequency of wave is at the intermediate frequency of bandwidth.For example, DC is carried in the 20MHz LTE signal with low-limit frequency 5030MHz Wave frequency rate is at 5040MHz.Therefore, (wherein frequency window 1 is low-limit frequency window), DC in the FFT of 256 frequency windows Carrier frequency window is window 128.As another example, in the FFT of 64 frequency windows, DC carrier frequency window is window 32.By setting window corresponding with the frequency location of DC carrier wave for DC carrier frequency window and determining in set frequency The signal strength of FFT at rate window, so that the signal of the expection characteristic at DC frequency window without LTE signal can be by Being classified as is not LTE.Note that DC frequency window be DC carrier wave should be located at LTE signal in predetermined window, and can with divided Practical DC carrier wave in the signal of class is related or uncorrelated.Relative to the first and second signal strengths, at DC frequency window Signal strength can be characterized as being " third " signal strength.
In some instances, to determine that the instruction 114 of the first signal strength can also include: to determine that third signal is strong The instruction that FFT is normalized before degree.This can be by removing the signal strength at the DC carrier frequency window in FFT It is realized with the euclideam norm of FFT.
Instruction 115 can be it is executable so that process resource 101 be based on the first signal strength, second signal intensity and Third signal strength, to classify to high frequency radio signal.
Signal strength (respectively the first and second signals at the first protection frequency window and the second protection frequency window Intensity) help to classify to the signal for not being 20MHz, it is not that 20MHz can make signal be unlikely to be LTE.For example, In 20MHz LTE signal with 5030MHz low-limit frequency, the first guard band (low guard band) can be from 5030 to 5031MHz, and the second guard band (high guard band) can be from 5049 to 5050MHz.In the FFT of the 20MHz signal In, low-limit frequency window can correspond to 5030MHz, and highest frequency window can correspond to 5050MHz.Due to these guarantors It protects frequency band to be not used, therefore information should not be sent by them, therefore at protection frequency window corresponding with these frequencies Amplitude should be zero.In some instances, there is the FFT of the signal of the amplitude higher than 0 to show at these protection frequency windows The signal is not 20MHz signal.For example, it can be 40MHz signal, 80MHz signal.
Therefore, instruction 115 can make process resource 101 strong based on the first signal with the signal strength higher than threshold value 0 Degree and/or second signal intensity determine that the signal is not LTE.In addition, instruction 115 can make process resource 101 be based on having The first signal strength and/or second signal intensity of intensity 0 determine that the signal is 20MHz signal, and therefore it is more likely that LTE。
In some instances, it is not 0 for the threshold value of frequency window is protected, is on the contrary higher to provide error margin.Separately Outside, threshold value might also depend on the resolution ratio provided by FFT.High-resolution FFT can have threshold more lower than low resolution FFT Value.Thus, for example, threshold value can be 0.005, and have 64 frequency windows in the FFT with 256 frequency windows FFT in, threshold value can be 0.05.These numbers can be normalized power as discussed above.For the first protection frequency The threshold value of window and the second protection frequency window can be characterized as being guard band threshold value.As described herein, if signal strength The power of description is weaker than threshold value, then it is assumed that the signal strength is lower than the threshold value.For normalized power, arithmetically it is less than threshold value Signal strength lower than threshold value (for example, 0.004 be lower than threshold value 0.005).The signal strength of " satisfaction " threshold value can be equal to or low In the threshold value.
In addition, the signal strength (third signal strength) at DC carrier frequency window further helps in and is by Modulation recognition LTE or Wi-Fi.LTE and Wi-Fi uses OFDM in PHY layer, and has multiple subcarriers.Son using FFT, with signal The consistent frequency resolution in carrier wave interval provides the signal strength of each subcarrier.Due between the subcarrier between Wi-Fi and LTE Difference between, the FFT of Wi-Fi signal shows that the signal at DC carrier frequency window declines, and the FFT of LTE is then not Display.Signal decline at DC carrier frequency window is relative to side frequency window.As it is used herein, if window It is continuous window, then a window is adjacent with another window.For example, frequency window 6 and frequency window 7 and frequency window 5 is adjacent.Lower than the third signal strength expression of the signal strength at adjacent window apertures, the signal is Wi-Fi rather than LTE.In addition, Signal strength at the DC carrier frequency window of Wi-Fi signal is lower than the average signal strength of FFT.In some instances, this It is a lower than including at least low 70%.
In some instances, third signal strength instruction more smaller than average signal strength on the frequency window of FFT should Signal is Wi-Fi rather than LTE.Therefore, in some instances, instruction 115 may include that process resource 101 is made to determine FFT The instruction of average signal strength.As it is used herein, can be by the way that the signal strength at each frequency window be added in one It rises and by the summation divided by the quantity of frequency window, to calculate the average value of FFT.
Therefore, instruction 115 can make process resource 101 based on third signal strength lower than the signal strength at adjacent window apertures And/or the average signal strength lower than FFT, to determine that the signal is LTE.In addition, instruction 115 can make 101 base of process resource In third signal strength higher than the signal strength at adjacent window apertures and/or higher than the average signal strength of FFT, to determine the signal It is Wi-Fi.
In some instances, instruction 115 can make process resource 101 consider the first before considering third signal strength One and second signal intensity.For example, the first and second signal strengths can be used for filtering out not be LTE signal.Because LTE is in height Frequently using the signal with 20MHz bandwidth in (and specifically, the frequency within the scope of 5GHz), so not being 20MHz bandwidth Signal is not LTE signal.Instruction 115 can make process resource 101 based on the first signal strength and second signal intensity to abandon Those signals, and it is classified into Wi-Fi.It indicates that the signal is 20MHz based on determining first and second signal strengths, refers to Enabling 115 can make process resource 101 consider third signal strength.
The calculating equipment 100 of the Fig. 1 described in the form of processor and machine readable storage medium may include in terms of Fig. 2 In terms of calculating equipment 200 or one or more structure or functions of the Wi-Fi access point 300 of Fig. 3, wherein to include hardware and software The form of function engine be described.
Fig. 2 is the block diagram of the calculating equipment 200 for classifying to high frequency radio signal.It is similar to calculate equipment 200 In calculating equipment 100.Calculating equipment 200 includes process resource 201 and machine readable storage medium 210.Process resource 201 is similar In process resource 101, and machine readable storage medium 210 is similar to machine readable storage medium 110.Instruction 211,212, 213,214,215 and 216 (coding) is stored on storage medium 210, and can be executed by process resource 201 to realize herein About Fig. 2 described function.
Instruction 211 can be executed by process resource 201, to receive the FFT of high frequency radio signal.In some instances, High frequency radio signal can be 5GHz radio signal.Instruction 211 is similar to instruction 111, and above with respect to instruction 111 It discusses and is suitable for this.
Instruction 212 can be executed by process resource 201, to determine the maximum intensity of FFT.As it is used herein, maximum Intensity includes the highest signal strength of FFT.This can be characterized as being the global peak of FFT or the maximum value of FFT.In some examples In, instruction 212 can realize this point by checking the amplitude of FFT and highest signal reading being labeled as maximum intensity.Certain A little signals are not large enough to by force interfere.As discussed about instruction 214, calculating equipment 200 can be used being somebody's turn to do for FFT Maximum intensity filters out the signal not interfered.
Instruction 213 can be executed by process resource 201, to determine in FFT higher than the quantity of the peak value of threshold value.Such as this paper institute It uses, the peak value in FFT includes frequency window, and wherein the signal strength at the adjacent window apertures of the frequency window two sides, which is lower than, is somebody's turn to do Signal strength at frequency window.For example, the signal strength at frequency window 100 can be -100dBm, at frequency window 101 Signal strength can be -80dBm, and the signal strength of frequency window 102 can be -100dBm.This will indicate that in frequency " peak value " of presence -80dBm at window 101.As another example, the signal strength at frequency window 104 can be -85dBm, Signal strength at frequency window 105 can be -67dBm, and the signal strength of frequency window 106 can be -50dBm.This It will indicate that there is no peak values among frequency window 104,105 and 106.These peak values can be characterized as being local peaking.Global peaks Value (as discussed about instruction 212) is also possible to local peaking.As it is used herein, number may include any number Word, which includes 0,1,2,3 etc..In other words, instruction 213, which can determine in FFT, has how many (if any) height In the peak value of specific threshold.
Threshold value can be arranged in a signal strength, on the signal strength, signal is considered as interference.As more than It is discussed, FFT can have the frequency window of different number.More frequency window quantity provide higher signal resolution Rate.Less frequency window quantity provides lower signal resolution.In some instances, specific threshold can depend on FFT Resolution ratio.According to Paasche Wa Er theorem (Parseval ' s Theorem), the gross energy of signal for any FFT resolution ratio and Speech is all identical.Therefore, as the resolution ratio of FFT increases, the signal strength at each frequency window may be reduced.? In some examples, in the case where FFT has 256 frequency windows, threshold value can be -89dBm.In another example, wherein FFT has 64 frequency windows, and threshold value can be -85dBm.
As discussed above, LTE signal is OFDM.Signal as OFDM may include at or greater than specific threshold Multiple peak values.Therefore, as discussed about instruction 214, calculating equipment 200 can be used the number of peaks in FFT to help Drainage except be not OFDM and be not therefore LTE signal.
Instruction 214 can be executed by process resource 201, to determine the signal strength and second at the first protection frequency window Protect the second signal intensity at frequency window.The determination can be in response to determining that the maximum intensity (being determined by instruction 212) is super Crossing intensity threshold and the quantity (being determined by instruction 213) is more than amount threshold.
Intensity threshold can be identical as threshold value used in instruction 214, to determine in " quantity " to which peak value It is counted.Therefore, in some examples that FFT has 256 frequency windows, intensity threshold can be -89dBm.In addition, FFT has in other examples of 64 frequency windows, and intensity threshold can be -85dBm.If described signal strength is (i.e. Power) it is better than threshold value, then it is assumed that and the signal strength is more than the threshold value.For dBM unit, lesser negative (such as -30dBm) It is better than biggish negative (- 90dBm).
Amount threshold can be a quantity, indicate that the signal is ofdm signal when the quantity of peak value is higher than the quantity. In some instances, amount threshold can be 10.In some instances, amount threshold can depend on the received FFT sample of institute, And it can be changed according to factors such as FFT resolution ratio.For example, believing with the OFDM indicated by low resolution FFT It number compares, more multi-peak can have by the ofdm signal that high-resolution FFT is indicated.In some instances, machine can be used Device study, to change and adjust the quantity based on each characteristic for the equipment for being used to provide FFT.In some instances, machine Device study may include the first baseline for calculating the rule that equipment to be followed, and allows to calculate equipment and is made based on those rules really It is fixed, and the determination of the calculating equipment is verified, and alteration ruler if necessary.
Therefore, instruction 212 can make process resource 201 determine that the FFT with 256 frequency windows has -67dBM most Big intensity.In addition, instruction 213 can make process resource 101 determine that the FFT with 256 frequency windows has 11 peak values (every A peak value has at least intensity of -85dBm).Maximum intensity can be compared with intensity threshold and determine maximum by instruction 214 Intensity is more than threshold value.The quantity of peak value can also be compared with amount threshold and be determined that the quantity of peak value is more than by instruction 214 Threshold value.Based on these determination, instruction 214 can make process resource 101 determine first protection frequency window at signal strength and Second signal intensity at second protection frequency window.However, based on determining that it is strong more than the maximum of intensity threshold that FFT does not have Degree, instruction 214 can make process resource 101 determine that the signal is not interference signal and ignores the signal.In addition, based on determining FFT has 10 peak values, and instruction 214 can make process resource 201 determine that the signal is not ofdm signal, and therefore not be LTE. In some instances, intensity threshold can be characterized as being first threshold, and amount threshold can be characterized as being second threshold, with As the mechanism distinguished between threshold value.
First signal strength, second signal intensity, the first protection frequency window and the second protection frequency window are similar respectively In such as about instruction 111,112 and 113 discussed the first signal strength, second signal intensity, first protection frequency window and Second protection frequency window.In addition, as discussed above, the normalization of the power of FFT can help to mitigate in sampling not Accuracy.In this way, instruction 214 can also include that can be executed by process resource 101, in response to determining that maximum intensity is more than first The instruction that threshold value and quantification are normalized FFT more than second threshold.Therefore, peak value is determined most on FFT Big intensity and quantity (in instruction 212 and 213), and determine that the first signal strength and second signal are strong on normalization FFT Degree.
Instruction 215 can be executed by process resource 201, to determine the third signal strength at direct current carrier frequency window. The determination can be in response to determining that the first signal strength and second signal intensity (in instruction 214) meet guard band threshold value. Third signal strength is similar to above with respect to third signal strength described in instruction 114.DC carrier frequency window be similar to On about instruction 114 described in DC carrier frequency window.Guard band threshold value is similar to above with respect to described in instruction 115 Guard band threshold value.
Therefore, instruction 214 can make process resource 201 determine that the FFT with 256 frequency windows has the of 0.005 One signal strength and 0.004 second signal intensity.Instruction 215 can make process resource determine that these signal strengths all meet threshold Value 0.005.In response to the determination, instruction 215 can make process resource 101 determine that the third signal at DC carrier frequency window is strong Degree.However, instruction 215 can based on FFT is determined with the first signal strength (for example, 0.0055,0.006 etc.) higher than 0.005 It so that process resource 101 determines that signal is not 20MHz, and is Wi-Fi by the Modulation recognition.
Instruction 216 can be executed by process resource 201, to be classified based on third signal strength to radiofrequency signal.This Similar to above with respect to third signal strength described in instruction 115.
As described above, FFT can have the frequency window of different number.The frequency window of higher amount provides higher letter Number resolution ratio.The frequency window of lower quantity provides lower signal resolution.Therefore, signal strength readings can depend on letter Number resolution ratio (that is, quantity of frequency window).In high-resolution FFT, the reading of more additional frequency windows can be provided Number.
Therefore, in some instances, in high-resolution FFT, instruction 216 can be executed by process resource 201 to be based on Signal strength at third signal strength (at DC frequency window) and two additional frequency windows is classified.First is attached Add frequency window can guard band (as described above) low to signal it is related, and the second additional frequency window can be with signal High guard band it is (as described above) related.
It is that can use certain amount when because LTE technology being operated in specific bandwidth using these additional frequency windows Subcarrier.For example, LTE uses 2048 subcarriers in 20MHz bandwidth, the subcarrier spacing with 15KHz.As more than It is discussed, this leaves 2MHz for guard band.On the other hand, Wi-Fi provides 64 subcarriers, and the son with 312.5KHz carries Wave spacing.This provides total bandwidth 17.8MHz used the and 2.2MHz as guard band.Therefore, the guarantor of two kinds of signals The difference of shield frequency band has the difference (the borderline 0.1MHz of each of signal) of 0.2MHz.Therefore, for the protection of Wi-Fi signal Frequency band can cross over broader frequency range than the guard band for LTE.
Therefore, it can be located at for the additional frequency window of low guard band and be directed to expected 20MHz Wi-Fi signal Low guard band the relevant frequency window of highest frequency at.For example, the minimum living shield of the 20MHz signal since 5030MHz Frequency band starts from 5030MHz.In LTE signal, which be can be from 5030 to 5031MHz.In Wi-Fi signal In, low guard band can be from 5030 to 5031.1MHz.It therefore, can be with for the additional frequency window of low guard band 5031.1MHz related.The additional frequency window can be characterized as being third protection frequency window.Because the additional frequency window with Low guard band is related, so the third frequency window is lower than DC frequency window.In some instances, which can be by 14 × N/256 determines that wherein N is the frequency window in FFT.Therefore, in the FFT with 256 frequency windows (N=256) In, which can be located at window 14.It is strong that signal strength at the additional frequency window can be characterized as being fourth signal Degree.
Similarly, additional frequency window relevant to high guard band can be located at and be directed to expected 20MHz Wi-Fi At the relevant frequency window of low-limit frequency of the high guard band of signal.For example, the height of the 20MHz signal since 5030MHz Guard band starts from 5049MHz.In LTE signal, which be can be from 5030 to 5031MHz.Believe in Wi-Fi In number, low guard band be can be from 5030 to 5031.1MHz.It therefore, can be with for the additional frequency window of low guard band It is related to 5031.1MHz.The additional frequency window can be characterized as the 4th frequency window.Because of the additional frequency window and high guarantor It is related to protect frequency band, so the 4th frequency window is higher than DC frequency window.In some instances, which can be by 244 × N/256 determines that wherein N is the frequency window in FFT.Therefore, in the FFT with 256 frequency windows (N=256), The frequency window can be located at window 244.It is strong that signal strength at the additional frequency window can be characterized as being the 5th signal Degree.
The classification of signal can be based on third signal strength (at DC carrier frequency window) and fourth signal intensity (low At guard band).It is lower than threshold value (that is, DC carrier wave threshold value) based on determining third signal strength, the instruction on storage medium 210 216 can make process resource 201 further check fourth signal intensity.It is lower than another threshold value based on determining fourth signal intensity (that is, minimum living shield frequency band threshold), the instruction on storage medium 210 can make process resource 201 believe Modulation recognition Wi-Fi Number.Frequency band threshold is protected at or above minimum living based on determining fourth signal intensity, the instruction on storage medium 210 can make to handle The Modulation recognition is LTE signal by resource 201.
Therefore, when third signal strength is lower than DC carrier wave threshold value, the classification of signal can based on third signal strength and Fourth signal intensity.However, based on finger of the third signal strength at or above DC carrier wave threshold value, on storage medium 210 is determined Order can make process resource 201 further check the 5th signal strength (at high guard band) rather than fourth signal intensity. It is lower than another threshold value (high guard band threshold value) based on determining 5th signal strength, the instruction on storage medium 210 can make to handle The Modulation recognition is Wi-Fi signal by resource 201.Based on determine the 5th signal strength at or above high guard band threshold value, Instruction on storage medium 210 can make process resource 201 by Modulation recognition LTE signal.
In some instances, DC carrier wave threshold value can be 0.039.In some instances, minimum living shield threshold value can be 0.010.In some instances, high protection threshold value can be 0.019.In some instances, engineering can be used in these threshold values It practises to be changed based on each characteristic for the equipment for being used to provide FFT and be adjusted.In some instances, machine learning can wrap The baseline for providing and calculating the rule that equipment to be followed is provided, allows to calculate equipment and is based on those rules and makes a determination, verify the meter Calculate the determination of equipment, and alteration ruler if necessary.
It, may due to low resolution in the FFT (FFT etc. with 64 frequency windows) that low resolution is provided It can not determine fourth signal intensity corresponding with low guard band and high guard band and the 5th signal strength.Therefore, at low point In resolution FFT, storage medium 201 may include that can be performed so that process resource 201 checks other characteristics of Wi-Fi signal Instruction.These instructions can be programmed, so that they are performed before executing 214,215 and 216.Therefore, these refer to Enable the quantity that can help to filter out the signal that can be handled by 214,215 and 216.Therefore, these instructions can be provided by processing Source 201 executes on FFT rather than on normalization FFT.
Instruction can be executed by process resource 201 to determine that peak value whether there is in scheduled frequency window.These are pre- Fixed frequency window can be related to Legacy Short Training Field (L-STF) in Wi-Fi signal.L-STF signal is that Wi-Fi is being opened Begin its data transmission before by its transmit signal.In L-STF, there are the signal peaks occurred at 12 given frequencies Value.There is Legacy Short Training Field signal by the signal of Wi-Fi transmission, and do not had then by the signal of LTE transmission.Therefore, it deposits Instruction on storage media 201 process resource 210 can be made determining with it is known in L-STF with the corresponding frequency of the frequency of peak value Signal strength at rate window.These frequency windows can be characterized as being L-STF frequency window.In some instances, these frequencies Rate window can be by the community Wi-Fi (for example, 802.11 standard of IEEE) Lai Dingyi.In some instances, determine signal strength with It determines and whether there is peak value at L-STF frequency window in the signal.Therefore, in some instances, at relative to adjacent window apertures Signal strength, the signal strength at L-STF frequency window can contribute to classify to signal.
Peak value can be determined by checking the signal strength of the adjacent window apertures of L-STF frequency window.If with L-STF frequency Signal strength at the adjacent window of rate window is lower than the signal strength at L-STF frequency window, then in the specific L-STF window There are peak values at place.If the signal strength at adjacent window apertures is greater than or equal to the signal strength at L-STF window, in the L- Peak value is not present at STF window.Based on determining there are 12 peak values, each peak value can be provided at L-STF frequency window by processing Source 201 execute instruction with by the Modulation recognition for Wi-Fi.The signal for being classified as Wi-Fi can be without further analyzing (that is, instruction 214,215 and 216).12 peak values are not present at L-STF frequency window based on determining, it can be by process resource 201 It executes instruction to determine the first signal strength at the first protection frequency window and the second signal at the second protection frequency window Intensity, as above with respect to described in instruction 214.Therefore, it can be determined at L-STF frequency window before FFT is normalized Peak value.In some instances, at least eight peak value (each peak value be L-STF frequency window 12 frequency windows it In at least eight frequency window in 1 peak value) signal can be classified as Wi-Fi signal.This allows sample error.
Then, therefore, in some instances, the instruction being stored on storage medium 210 may include to determine that FFT is mentioned For the instruction of which kind of resolution ratio.Based on determine FFT provide resolution ratio it is higher (at least 100KHz, for example, 100KHz, 90KHz, 80KHz etc.), the instruction on storage medium 210 can determine the additional letter at additional frequency window relevant to low guard band Additional signal strength at number intensity and additional frequency window relevant to high guard band.Based on point for determining that FFT is provided Resolution is lower (being higher than 100KHz, such as 110KHz, 120KHz), and the instruction on storage medium 210 can determine L-STF frequency window Signal strength at mouthful.
The calculating equipment 200 of the Fig. 2 described in the form of processor and machine readable storage medium may include the calculating of Fig. 1 In terms of one or more structure or functions of the Wi-Fi access point 300 of equipment 100 or Fig. 3, with the function comprising hardware and software Can the form of engine be described.For example, calculating equipment 200 can have to realize such as the normalizing described in Fig. 3 Change the instruction of the function of engine 302.
Fig. 3 shows the block diagram of Wi-Fi access point 300.In some instances, access point 300 can be via Ethernet electricity Cable is connected to cable router/switches/hubs, and Wi-Fi signal is projected to specified region, to create wireless local area Net (WLAN).Wi-Fi access point 300 includes FFT engine 301, normalization engine 302 and classification engine 303.It will retouch below State each aspect in these aspects of Wi-Fi access point 301.Other engines can be added to Wi-Fi access point 301 with In additional or alternative function.
Each engine in engine 301,302,303 and any other engine can be hardware (for example, such as integrated circuit Or the processors such as other circuits) with software (for example, machine or processor-executable instruction, order or such as firmware, programming or The codes such as object code) any combination, to realize the function of corresponding engine.This combination of hardware and programming can be with a variety of Different mode is realized.The combination of hardware and software may include hardware (that is, the not hardware element of software element), trustship Software (for example, software that storage is executed in memory and at processor or explained) or hardware on hardware with The software of trustship at hardware.In addition, as it is used herein, singular " one " and "the" include plural, unless on It is hereafter otherwise expressly specified.Thus, for example, term " engine " is intended to indicate that the combination of at least one engine or engine.Some In example, Wi-Fi access point 300 may include other engine.
Each engine of Wi-Fi access point 300 may include at least one machine readable storage medium (for example, more than one It is a) and at least one computer processor (for example, more than one).For example, providing engine function on Wi-Fi access point 300 Software can store on the memory of computer, with by the processor of the computer execute.
FFT engine 301 is the engine of Wi-Fi access point, and FFT engine 301 includes that Wi-Fi access point is allowed to receive signal The combination of the hardware and software of FFT.As discussed above, which can be high frequency radio signal.In some instances, High frequency radio signal can be the channel in particular frequency range.For example, can be right on the channel 7 in 5GHz frequency range Signal is transmitted.As another example, signal can be transmitted on the channel 50 in 5GHz frequency range.FFT draws Holding up 301 may be implemented such as about instructing 211 described functions.In some instances, FFT engine 301 allows Wi-Fi access point 300 receive multiple FFT (for example, the first FFT, the 2nd FFT, the 3rd FFT) of identical signal.In some instances, these FFT can With mutually the same resolution ratio.
Normalization engine 302 is the engine of Wi-Fi access point 300, and normalization engine 302 includes allowing Wi-Fi access point 300 determine the combination of the hardware and software of the maximum intensity of FFT.Normalization engine 302 also allows Wi-Fi access point 300 to determine More than the quantity of the peak value of first threshold in FFT.Therefore, normalization engine 302 may be implemented as about 212 and 213 institutes of instruction The function of description.As described above, FFT engine 301 can receive multiple FFT of identical signal.Therefore, normalization engine 302 can With the maximum intensity of each FFT of determination, and determine the quantity of the peak value in each FFT.Then, normalization engine 302 can be with The standard for meeting max-thresholds and number of peaks within special time period based on determining FFT carries out normalizing to each FFT Change and FFT is averaging.For example, the period can be set to 1 microsecond.FFT engine 301 can receive the FFT of signal Up to 1 microsecond.Normalization engine 302 can determine the maximum intensity of each FFT received in the microsecond.Normalize engine 302 can also determine the quantity of the peak value of each FFT received in the microsecond.It is received in the microsecond based on determination The FFT of certain percentage in FFT is included 1) more than the maximum intensity of intensity threshold and 2) more than the peak value of amount threshold Quantity, normalization engine 302 can be normalized each FFT and be averaging to all FFT, to determine average FFT, use To indicate the FFT received in the period.The percentage can be 100% (for example, what is received in the microsecond is all ), or most of (51%) etc. FFT.It is discontented based on the FFT of the certain percentage in the determining FFT received in the microsecond Sufficient condition 1 and/or 2 then restarts and resets the period.
Classification engine 303 is the engine of Wi-Fi access point 300, and classification engine 303 includes allowing Wi-Fi access point 300 true The hardware of the second signal intensity at the first signal strength and the second protection frequency window at fixed first protection frequency window with The combination of software.In some instances, which can carry out for the average FFT determined by normalization engine 302.Point Class engine 303 can also allow for Wi-Fi access point 300 to meet third threshold based on determining first signal strength and second signal intensity Value, to determine the third signal strength at DC carrier frequency window.In addition, classification engine 303 can be based on third signal strength To classify to radiofrequency signal.Therefore, classification engine 303 may be implemented such as the function described in instruction 214,215 and 216 Energy.
In some instances, FFT engine 301 can determine that FFT is low resolution FFT or high-resolution FFT.The determination Normalization engine 302 and classification engine 303 can be had an impact.Based on determining, received FFT provides low resolution, normalizing The signal strength at the L-STF frequency window of the FFT received within a preset period of time can be checked by changing engine 302.Based on true Determining the FFT of the certain percentage in FFT, there is no peak values (and to meet peak threshold and quantity threshold at L-STF frequency window Value, as described above), normalization engine 302 can be normalized and be averaging to FFT as described above.It is received based on determination FFT provide high-resolution, normalization engine 302 do not have to check L-STF frequency window.
Determine that the received FFT of institute provides high-resolution based on FFT engine 301, classification engine 303 can determine that third is protected The 5th signal strength at fourth signal intensity and the 4th protection frequency window at frequency window, as described above, to have Help classify to signal.Fourth signal intensity and the 5th signal strength can be based on determined by normalization engines 302 Average FFT.
The Wi-Fi access point 300 of the Fig. 3 described in the form of the function engine comprising hardware and software may include Fig. 1 Calculating equipment 100 or Fig. 2 calculating equipment 200 one or more structure or functions in terms of, be with processor and machine The form of readable storage medium storing program for executing describes.
Fig. 4 shows the FFT (being described by gray line) of 20MHz LTE signal and the FFT of 20MHz Wi-Fi signal (by black line Describe), both there are 256 frequency windows.Two FFT have been normalized.Therefore, the unit of x-axis is frequency window, and The unit of y-axis is normalized power.400A marks minimum living to protect band region, and 400B marks high guard band region.Because LTE believes Number and Wi-Fi signal be all 20MHz, so two FFT in region 400A and 400B all have low normalized power.400C mark Remember the subcarrier region DC.As shown in figure 4, Wi-Fi FFT the region have power decline and LTE FFT does not have then.Therefore, the area Domain can be used for helping distinguish between LTE FFT and Wi-Fi FFT.
400D label additional frequency window area relevant to minimum living shield band region, and 400E is indicated and is protected with high The relevant additional frequency window area of band region.401D shows the feature of 400D.401E shows the feature of 400E.
As shown in 401D, the low guard band of the minimum living shield band ratio LTE signal of Wi-Fi signal crosses over more frequencies Window.Similarly, as shown in 401E, the high guard band of the high guard band ratio LTE signal of Wi-Fi signal is across more Frequency window.Therefore, these regions can be used for helping distinguish between LTE FFT and Wi-Fi FFT.
Fig. 5 shows the flow chart of the method 500 for classifying to high frequency radio signal.Although below with reference to figure 3 Wi-Fi access point 300 describes the execution of method 500, but be available with for execute method 300 other are appropriate Equipment (for example, calculating equipment 200 of the calculating equipment 100 of Fig. 1 or Fig. 2).In addition, being practiced without limitation to for method 500 is such Example, and can be used for any suitable equipment or system described herein or other.
At the 510 of method 500, FFT engine 301 receives the first FFT of high frequency radio signal.As discussed above , high frequency radio signal can be on the particular channel within the scope of 5GHz.At the 520 of method 500, engine 302 is normalized Determine the first maximum intensity of the first FFT.At 530, normalization engine 302 is determined in the first FFT higher than first threshold First quantity of peak value.As described above, first threshold can be intensity threshold.In some instances, for 5GHz signal, the threshold Value can be -85dBm.540, FFT engine 301 receives the 2nd FFT of high frequency radio signal.At 550, engine is normalized 302 can determine the second maximum intensity of the 2nd FFT.At 560, normalization engine 560 can be determined to be higher than in the 2nd FFT Second quantity of the peak value of first threshold.At 570, normalization engine 302 can be determined based on the first FFT and the 2nd FFT Average FFT.570 can all meet first threshold in response to determining the first maximum value and the second maximum value and determine the first quantity All meet second threshold with the second quantity.In some instances, normalization engine 302 can be asked to the first FFT and the 2nd FFT Before the average average FFT with acquisition, the first FFT is normalized and the 2nd FFT is normalized.
At 580, classification engine 303 can protect the signal strength of the average FFT at frequency window, second based on first The signal strength of the average FFT at frequency window and the signal strength of the average FFT at DC carrier frequency window are protected, is come Classify to high frequency radio signal.First protection frequency window, the second protection frequency window and DC carrier frequency window class Those of it is similar to discuss window above with respect to Fig. 1.
Although the process of Fig. 5 shows the specific of certain functions and executes sequence, method 500 is not limited to the sequence. For example, some functions of continuously showing in flow chart can be executed in different order, it can simultaneously execute or part is same When execute or executed with their combination.In some instances, 540 can start before 520 complete.Though in addition, Right Fig. 5 specifically mentions the first FFT and the 2nd FFT, but there may be the received additional FFT (for example, 8 additional FFT) of institute.Example Such as, it can be received before 570 and analyze the 3rd FFT.Then, in response to also having maximum intensity and height higher than first threshold In the number of peaks of second threshold additional FFT and execute 570.Then, the average value determined in 570 is based on the first FFT, the Two FFT and any additional FFT.
Fig. 6 is the flow chart using the high-resolution FFT method classified to high frequency radio signal.Although joining below The Wi-Fi access point 300 for examining Fig. 3 describes the execution of method 600, but be available with for execute method 600 other are suitable When equipment (for example, calculating equipment 200 of the calculating equipment 100 of Fig. 1 or Fig. 2).In addition, method 600 is practiced without limitation to this The example of sample, and can be used for any suitable equipment or system described herein or other.
610, FFT engine 301 receives the FFT of high frequency radio signal within a predetermined period of time.As described above, this is predetermined Period can continue 1 microsecond.The FFT received can provide the high-resolution of radio signal.At 620, normalization is drawn Hold up the maximum intensity of each FFT in the 302 determining FFT received at 610.At 630, normalization engine 302 determines every Higher than the quantity of the peak value of first threshold in a FFT.Therefore, each FFT will have a number, each FFT of the digital representation It is higher than the peak value of first threshold with how many.As discussed above, which can be intensity threshold.At 671, Normalization engine 302 determines whether the maximum intensity of each FFT is higher than first threshold.Used in the first threshold and 630 Threshold value is identical.There is the maximum intensity higher than first threshold, method based on the determining each FFT received in predetermined amount of time Proceed to 672.Had based at least one determining FFT (from all FFT received within a predetermined period of time in 610) Meet the maximum intensity of (being equal to or less than) first threshold, method is back to 610 to receive new FFT.Old FFT is lost It abandons.
Referring back to 672, normalization engine 302 determines whether the number of peaks of each FFT is higher than second threshold.As more than It is discussed about instruction 214, which can be amount threshold and indicate that the signal is ofdm signal.In other words, At 672, normalization engine 302 determines whether each FFT received within a predetermined period of time has enough peak values.It is based on Determine that each FFT has enough peak values, method proceeds to 673.It (is derived from 610 pre- based at least one determining FFT The FFT received in section of fixing time) have meet (being equal to or less than) second threshold multiple peak values, method back to 610 with Receive new FFT.Old FFT is dropped.
Referring back to 673, each FFT received in predetermined period is normalized in normalization engine 302, then Normalization FFT is averaging to obtain average FFT.At 681, classification engine 303 determines the highest frequency window in average FFT The signal strength at place and the signal strength at the low-limit frequency window of average FFT.Highest frequency window can correspond to the letter Number high guard band, and low-limit frequency window can correspond to the low guard band of the signal.In other examples, and As above with respect to described in instruction 112 and 113, classification engine 303 can be determined and the low guard band (12 in average FFT A low-limit frequency window) signal strength at corresponding all frequency windows, and these signal strengths are averaging with true Surely it is directed to the signal strength of low guard band.In addition, classification engine 303 can determine and the high guard band (12 in average FFT A highest frequency window) signal strength at corresponding all frequency windows, and these signal strengths are averaging with true Surely it is directed to the signal strength of high guard band.Then these signal strengths can be used at 682.
At 682, classification engine 303 determines whether the signal strength determined at 681 is more than third threshold value.Such as the above institute It discusses, which can be guard band threshold value.It is all super based on the either signal intensity determined in two signal strengths Third threshold value is crossed, method is back to 610 to receive new FFT.Old FFT is dropped.This is because this demonstrate signals not to be 20MHz, and therefore cannot be the LTE run at high frequencies.
All meet and (be equal to or less than) third threshold value based on determining two signal strengths, method is moved to 683.At 683, Classification engine 303 determines the signal strength at the DC carrier frequency window of average FFT.At 684, classification engine 303 is determined Whether the signal strength at DC carrier frequency window is lower than the 4th threshold value.It states as discussed above, the 4th threshold value can be DC Carrier wave threshold value (0.039).The 4th threshold value is equaled or exceeded based on determining signal strength (determining at 683), method proceeds to 685.Based on signal strength (determining at 683) is determined lower than the 4th threshold value, method is forwarded to 689.
At 685, classification engine 303 checks the relevant additional frequency window of low to signal guard band.This can be by It is characterized as third protection frequency window.In some instances, this protection frequency window can be defined as 14 × N/256, Middle N is the quantity of the frequency window in average FFT.At 686, classification engine 303 determines that signal strength (determining at 685) is It is no to be equal to or higher than the 5th threshold value.As discussed above, the 5th threshold value is minimum living shield frequency band threshold.In some instances, this A 5th threshold value is 0.010.Based on the signal strength determined at 685 is determined equal to or higher than the 5th threshold value, method 600 is advanced To 687, wherein Modulation recognition is LTE signal by classification engine 303.Based on determining the signal strength determined at 685 lower than the Five threshold values, method 600 proceed to 688, and wherein Modulation recognition is Wi-Fi signal by classification engine 303.
Referring back to 684, the 4th threshold value (i.e. DC carrier wave threshold value) is lower than based on determining signal strength (determining 683), side Method proceeds to 689.At 689, classification engine 303 checks additional frequency window relevant to the high guard band of signal.This Third protection frequency window can be characterized as being.In some instances, this protection frequency window can be defined as 244 × N/ 256, wherein N is the quantity of the frequency window in average FFT.At 690, classification engine 303 determines signal strength (at 689 Determine) whether it is equal to or higher than the 5th threshold value.In this case, the 5th threshold value is high guard band threshold value.In some examples In, the 5th threshold value is 0.019.Based on determining that signal strength (at 689 determine) is equal to or higher than the 5th threshold value, before method 600 692 are entered, wherein Modulation recognition is LTE signal by classification engine 303.It is lower than based on determining signal strength (being determined at 689) 5th threshold value, method 600 proceed to 691, and wherein Modulation recognition is Wi-Fi signal by classification engine 303.
Although the process of Fig. 6 shows the specific of certain functions and executes sequence, method 600 is not limited to the sequence. For example, some functions of continuously showing in flow chart can be executed in different order, it can simultaneously execute or part is same When execute, or executed with their combination.
Fig. 7 is using low resolution FFT come the flow chart for the method classified to high frequency radio signal.Although following Describe the execution of method 700 with reference to the Wi-Fi access point 300 of Fig. 3, but be available with for execute method 700 other Equipment (for example, calculating equipment 200 of the calculating equipment 100 of Fig. 1 or Fig. 2) appropriate.In addition, method 600 is practiced without limitation to Such example, and can be used for any suitable equipment or system described herein or other.
Other than being low resolution by the resolution ratio that FFT is provided in method 700,710,720,730,771 and 772 points It Lei Siyu 610,620,630,671 and 672.
Because FFT provides low resolution, at 773, normalization engine 302 can be determined to be received at 710 Each FFT in the relevant frequency window of Legacy Short Training Field (L-STF) at signal strength.This allows Wi-Fi to access Point 300 filters out the signal as Wi-Fi.At 774, whether normalization engine 300 determines each FFT in L-STF frequency window There is peak value at mouthful.Have at least eight peak value (at least eight in 12 L-STF frequency windows based on each FFT of determination Frequency window), method proceeds to 781, and wherein the Modulation recognition is Wi-Fi signal by classification engine 303.
Do not have peak value at L-STF frequency window (for example, one based at least one determining FFT (receiving at 710) FFT only has 7 peak values in 7 frequency windows in 12 L-STFT frequency windows), method proceeds to 775.At 775, The each FFT received in predetermined period is normalized in normalization engine, is then averaging normalization FFT to obtain Average FFT.
The 782 of method 700 are similar to the 681 of method 600.In addition in the FFT with 64 frequency windows, 3 minimum Frequency window both corresponds to low guard band, and 3 highest frequency windows both correspond to except high guard band, method 700 783 be similar to method 600 682.The 784 of method 700 are similar to the 683 of method 600.At 785, classification engine 303 is true Be scheduled at DC carrier frequency window (determining at 784) whether relative to direct current carrier frequency window adjacent window apertures and there is letter The decline of number intensity.As described above, adjacent window is applicable to herein.Signal may be not present relative to adjacent window apertures based on determining Decline, method proceed to 787, and wherein the Modulation recognition is LTE signal by classification engine 303.Based on determining relative to adjacent windows Mouthful and there are signal strength decline, method proceeds to 786, wherein classification engine 303 by the Modulation recognition be Wi-Fi signal.
Although the process of Fig. 7 shows the specific of certain functions and executes sequence, method 700 is not limited to the sequence. For example, some functions of continuously showing in flow chart can be executed in different order, it can simultaneously execute or part is same When execute or executed with their combination.
All features disclosed in this specification (include any accompanying claims, abstract and drawings) and/or such public affairs All elements of any method or process opened can be combined in any combination, in this way in addition to wherein at least some Feature and/or element be mutual exclusion combination except.

Claims (20)

1. a kind of non-transitory machinable medium, including instruction, described instruction when executed, make process resource:
Receive high frequency radio signal Fast Fourier Transform FFT, wherein the FFT include direct current DC carrier frequency window, Frequency window and the second protection higher than the DC carrier frequency window are protected lower than the first of the DC carrier frequency window Frequency window；
Determine the first signal strength at the first protection frequency window；
Determine the second signal intensity at the second protection frequency window；
Determine the third signal strength at the DC carrier frequency window；And
It is wireless to the high frequency based on first signal strength, the second signal intensity and the third signal strength Electric signal is classified.
2. storage medium according to claim 1,
Wherein, guard band threshold value is met based on first signal strength, the second signal intensity meets the protection frequency With threshold value and the third signal strength is lower than DC threshold value, is long term evolution LTE by the Modulation recognition.
3. storage medium according to claim 1,
Wherein, the FFT provides the low resolution of the signal；
Wherein, the FFT includes Legacy Short Training Field L-STF frequency window；And
Wherein, the signal strength being classified based at the L-STF frequency window.
4. storage medium according to claim 1,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the first protection frequency window corresponds to the low 1MHz guard band in the signal；And
Wherein, the second protection frequency window corresponds to the high 1MHz guard band in the signal.
5. storage medium according to claim 1,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the FFT provides at least resolution ratio of 100KHz；And
Wherein, the fourth signal being classified based at the third protection frequency window lower than the DC carrier frequency window is strong Degree.
6. storage medium according to claim 5,
Wherein, the first protection frequency window and the guard band in the signal start associated, and the third Protect frequency window associated with the ending of the guard band.
7. storage medium according to claim 1,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the FFT provides at least resolution ratio of 100KHz；And
Wherein, the fourth signal being classified based at the third protection frequency window for being higher than the DC carrier frequency window is strong Degree.
8. storage medium according to claim 7,
Wherein the second protection frequency window and the guard band in the signal start associated, and third guarantor It is associated with the ending of the guard band to protect frequency window.
9. storage medium according to claim 1,
Wherein, the FFT includes maximum signal；And
Wherein, the maximum signal being classified based on more than intensity threshold.
10. storage medium according to claim 1,
Wherein, the FFT includes multiple peak values more than intensity threshold；And
Wherein, the quantity for being classified based on the peak value.
11. a kind of non-transitory machinable medium, including instruction, described instruction when executed, make process resource:
Receive the FFT of high frequency radio signal；
Determine the maximum intensity of the FFT；
It determines in the FFT more than the quantity of the peak value of first threshold；
It is more than the first threshold in response to the determination maximum intensity and determines that the quantity is more than second threshold, and determines The first signal strength at the first protection frequency window and the second signal intensity at the second protection frequency window；
Meet third threshold value in response to determination first signal strength and the second signal intensity, and determines and carried in direct current DC The third signal strength of wave frequency rate window；And
Classified based on the third signal strength to the high frequency radio signal.
12. storage medium according to claim 11,
Wherein, a threshold value is higher than based on the third signal strength, is LTE by the Modulation recognition.
13. storage medium according to claim 11,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the FFT includes at least resolution ratio of 100KHz；
Wherein, the storage medium includes instruction, and described instruction when executed, makes the process resource: determining lower than institute State the fourth signal intensity at the third protection frequency window of direct current frequency window；And
Wherein, described to be classified based on the fourth signal intensity.
14. storage medium according to claim 11,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the FFT includes at least resolution ratio of 100KHz；
Wherein, the storage medium includes instruction, and described instruction when executed, makes the process resource: determining and is being higher than institute State the fourth signal intensity at the third protection frequency window of direct current frequency window；And
Wherein, described to be classified based on the fourth signal intensity.
15. storage medium according to claim 11,
Wherein, the high frequency radio signal includes 5GHz signal；
Wherein, the FFT includes the resolution ratio lower than 100KHz；
Wherein, the storage medium includes instruction, and described instruction when executed, makes the process resource: determining in the FFT In Legacy Short Training Field L-STF frequency window at signal strength；And
Wherein, the signal strength being classified based at each L-STF frequency window.
16. a kind of method, comprising:
The first FFT of high frequency radio signal is received at the network equipment；
The first maximum intensity of the first FFT is determined by the network equipment；
It is determined in the first FFT by the network equipment more than the first quantity of the peak value of first threshold；
The 2nd FFT of the high frequency radio signal is received at the network device；
The second maximum intensity of the 2nd FFT is determined by the network equipment；
It is determined in the 2nd FFT by the network equipment more than the second quantity of the peak value of the first threshold；
The first threshold is above in response to determination first maximum intensity and second maximum intensity and determines institute It states the first quantity and second quantity is above second threshold:
Average FFT is determined based on the first FFT and the 2nd FFT by the network equipment；And
Signal strength by the network equipment based on the average FFT in the first protection frequency window, in the second protection The letter of the signal strength of the average FFT at frequency window and the average FFT at direct current DC carrier frequency window Number intensity, to classify to the high frequency radio signal.
17. according to the method for claim 16,
Wherein, the first FFT provides the low resolution of the high frequency radio signal；
Wherein, the 2nd FFT provides the low resolution of the high frequency radio signal；And
Wherein, which comprises
The signal strength of the Legacy Short Training Field frequency window in the first FFT is determined by the network equipment；With And
The signal strength of the Legacy Short Training Field frequency window in the 2nd FFT is determined by the network equipment.
18. according to the method for claim 16,
Wherein, the normalized FFT includes at least resolution ratio of 100KHz；And
Wherein, the institute being classified based at the third protection frequency window lower than the direct current frequency window of the type State the signal strength of average FFT.
19. according to the method for claim 16,
Wherein, the normalized FFT includes at least resolution ratio of 100KHz；And
Wherein, the institute being classified based at the third protection frequency window for being higher than the direct current frequency window of the type State the signal strength of average FFT.
20. according to the method for claim 16,
Wherein, the high frequency radio signal is classified as LTE signal.
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